. Kirkes' handbook of physiology . edcomplemental colors. Each spectral color has its complemental color, a factthat is represented in figure 473. The complemental colors of greatest physi-cal significance are red and green (greenish blue), yellow and deep blue(indigo blue), green (greenish yellow), and violet. Positive after-images of color exist for a brief moment, but the greatest COLOR-BLINDNESS 661 significance attaches to the negative after-images. The negative after-imagesof color following the stimulus of colored light upon the retina are not thesensation of color produced by the color
. Kirkes' handbook of physiology . edcomplemental colors. Each spectral color has its complemental color, a factthat is represented in figure 473. The complemental colors of greatest physi-cal significance are red and green (greenish blue), yellow and deep blue(indigo blue), green (greenish yellow), and violet. Positive after-images of color exist for a brief moment, but the greatest COLOR-BLINDNESS 661 significance attaches to the negative after-images. The negative after-imagesof color following the stimulus of colored light upon the retina are not thesensation of color produced by the color of an object, but are the oppositeor complemental color. The after-image of red is, therefore, green, andthat of green, red; that of violet, yellow and of yellow, violet, etc. Thesame relation holds with the other colors. A condition for the developmentof a strong after-image is that the primary image shall have continued to acertain degree of fatigue. The colors which reciprocally excite each other C GnenisKliluc ) Yellow Violet. JhdigCj OrOHOt JiiJ Fig. 473.—Geometrical Color Table for Determining the Complemental Colors. in the retina are those placed at opposite points in the color table, figure after-images of color are most intense in the axis of the visual field andare not always present in the periphery of the retina, as can readily be seenby examining the chart, figure 471. Color sensations may also be produced by contrast. Thus, a very smalldull gray strip of paper, lying upon an extensive surface of any bright color,does not appear gray, but has a faint tint of the color which is the comple-ment of that of the surrounding surface. A strip of gray paper upon a greenfield, for example, appears to have a tint of red, and when lying upon a redsurface, a greenish tint; it has an orange-colored tint upon a bright bluesurface, and a bluish tint upon an orange-colored surface; a yellowish colorupon a bright violet, and a violet tint upon a bright yellow surface. T
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